IRC7, the ultimate IRC client for Windows Phone, is now available as a FREE version! The full version of IRC7 is part of Microsoft's "Social Apps" Collection in Finland and it's regarded as the most advanced IRC client for Windows Phone.

This review says it all: "I think this is just about as good as an IRC client can be on a phone."

Changes in version 2.3:* Small bugfixes in a preparation for a big 3.0...